code: def test_zero_mean(self):
      sine_series = st(length=50)
      with pytest.raises(ValueError):
          model = FourTheta(
              model_mode=ModelMode.MULTIPLICATIVE,
              trend_mode=TrendMode.EXPONENTIAL,
          )
          model.fit(sine_series)
  
file_path: darts/darts/tests/models/forecasting/test_4theta.py
imports: import random
  import numpy
  import pytest
  from darts.metrics import mape
  from darts.models import FourTheta, Theta
  from darts.utils.timeseries_generation import linear_timeseries
  from darts.utils.timeseries_generation import random_walk_timeseries
  from darts.utils.timeseries_generation import sine_timeseries
  from darts.utils.utils import ModelMode, SeasonalityMode, TrendMode
label_desc: Use image node_id 3 for calling the TestFourTheta obj's underlying member method code with example usage: obj.test_zero_mean() without return types